Duplex envelope



D. W. SNYDER DUPLEX ENVELOPE Filed April 19, 192s May 8, 1928.

Patented May 8, 1928.

PATENT OFFICE. y

DAVII) W. SNYDER, 0F CHICAGO, ILLINOIS.

DUPLEX iiNvEriorE.

'Application led April 19, 1926.` Serial No. 102,841.

This invention has for its object to .rovide a very simple, cheap and efficient mai ing envelope of the type which comprises a large receptacle for containing merchandise anda smaller receptacle 'to receive a letter or 1nvoice or bot The main object of the present invention is to provide a device of the character above mentionedV which is so constructed as to enable it to be easily produced and printed, ready for use, in a single passage through a machine performing successively the simple operations necessary so that the actual cost of the finished article is no greater than, approximately, the additional paper and adhesive over and above the cost of the ordinary plain envelopey of the particular type hereinafter mentioned and particularl disclosed in Letters Patent ofthe United tates No. 1,265,270, granted to me on the 7th day of May, 1918.

The present invention is fully illustrated in the accompanying drawings wherein Fig. 1 is a view in elevation of a flat tu bular paper structure with adhesive applied preparatory to folding to provide the completed structure. l

Fig. 2 is a view in elevation of a completed envelope constructed in accordance with the invention, and Y Fig. 3 is a longitudinal sect-ion of the same on the line 3--3 of Fig. 2.

In, manufacturing the envelope of the present invention, a strip of paper of suitable width is passed through the machine .illustrated and described in the aforesaid Letters Patent, to thereby primarily produce the flat tubular structure A shown in Fig. 1, the latter being provided at its ends with closure flaps B and C at opposite ends. The flap B is integral with one wall of the tubular body A and the flap C is integral with the other wall thereof, said flaps constituting extensions of said respective walls. One

of said walls is, in part, of double thickness where one side edge portion D of the strip of paper overlaps the other side edge portion E thereof and is cemented thereto.

The closure ila B is cut away at its side edges, the said gap being-cut out ofthe wall ofthe next succeeding tubular structure with which the flap B of the latter is inte ral. The Hap C is,-therefore, of double thic ness at its side edge portions by reason of being composed in part ofthe portions F of the wall with which the flap B is integral, the said flap C being folded over along the dotted line G or a line parallel with the same outwardly thereof but permitting the free end portion of said flap to overlap the opposite wall of the structure to effect closure, it being obvious that the flaps B and C may be inserted into the ends of the tubular portion A of the structure to effect substantial but unsealed closure thereof.

In passing through the machine aforesaid, adhesive is applied to either or both the flaps B and C over areas such as the area H of the flap B and the area I of flapC. The adhesive is also applied to the area J of the wall'to be overlapped by one of said y flaps B or C in effecting sealing of one end of the tubular body A. In the instance illustrated, the area J of the wal] to be overlapped by the flap B is covered with adhesive, the machine of the aforesaid patent being easily equipped with the necessary adhesive applying devices to accomplish this.

The body A is then folded over upon or along the dotted line K so that the area J overlaps and becomes cemented to a portion of the same wall of the body A as that carrying said adhesive area. The structure is now complete and presents two receptacles having in effect, a common bottom, one of said receptacles being of greater depth than the other but both being of equal width.

`Printing exposed areas of the completed Structure constitutes the final step in the course of manufacture and follows the aforesaid several steps as part of a continuity of operations performed by the one machine, such, for example, as that of the aforesaid patent modifiedto perform the additional operations.

From the foregoing 'it will be obvious that the structure of my invention involves practically no cost in excess of that of an ordinary flatpaper bag thanV the cost of the additional paper, adhesive and printers ink consumed. It is, therefore, exceedingly cheap while well adapted to commercial uses.

I claim as my invention A duplexenvelope consistingof a single integral sheet of paper having parallel'side edges and having its side edge portions folded over into overlapped position and cemented together to form a fiat tube open at both ends, the opposed walls of said strucsure flaps for the respective ends of the tnbular structure when folded in respectively opposite directions, said structure folded between its ends on a line perpendicular to its side edges and nearer to one Athan to the other lend thereof to thereby provide a tvvoA pocket structure having the open ends of its pockets spaced from each other a-distance v not less than the length of one of said closure flaps with the latter both disposed to be folded in the same direction to effect elosure of the respective pockets, said overlapped portions of said structure cemented together.

DAVID W. SNYDER. 

